Enzyme activities and membrane lipids in Artemia cysts after a long duration space flight
| Autor: | Y. Gaubin, H. Planel, C Cariven, B. Pianezzi, Soleilhavoup Jp, Prevost Mc |
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| Rok vydání: | 1996 |
| Předmět: |
Atmospheric Science
medicine.medical_specialty Phospholipase A Membrane lipids Phospholipid Aerospace Engineering Astronomy and Astrophysics Metabolism Phospholipase chemistry.chemical_compound Geophysics Endocrinology chemistry Space and Planetary Science Phosphatidylcholine Internal medicine medicine General Earth and Planetary Sciences Incubation Pyruvate kinase |
| Zdroj: | Advances in Space Research. 18:221-227 |
| ISSN: | 0273-1177 |
| Popis: | In the Free Flyer Biostack Experiment (L.D.E.F. mission) investigations have shown that biological objects in a resting state can survive more than 5.5 years of exposure to the space factors in particular microgravity and cosmic rays. We have measured enzyme activities involved in metabolic pathways of sugar and lipid degradation and determined phospholipid composition. Pyruvate kinase and glucose-6-phosphate dehydrogenase activities in space-exposed cysts were higher than in earth controls after 1 hour incubation. In controls, total phospholipids remained unchanged, on the contrary they increased significantly in space-exposed cysts. The rate of metabolism of various phospholipid components was unchanged in controls allowing the development while the level of most of them decreased in space-exposed cysts except for phosphatidylcholine. Enzyme activities (acetylhydrolase, phospholipase A 2 and lyso phospholipase) involved in phospholipid degradation increased; however, activities were much higher in space-exposed cysts. In conclusion, the long duration space flight resulted in an increase of the metabolic activity correlated with a faster development within the first 20 hours of post flight incubation. |
| Databáze: | OpenAIRE |
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